# Best Practices

## REST API

Before you begin using APIs, keep the following best practices in mind to ensure success:

- The standard BillingPlatform instance allows for **100,000 API requests per 24 hours**.
We recommend no more than **15 API requests per second**.
- Rather than creating multiple requests, create a single request and put all the information there.
- Simple workflows process more quickly. The bigger the dataset, the longer the processing time.
When creating records, it is quicker to send all items at once rather than separately.
- **Session management is important**. Try to stay in the same session for as long as possible.
- Create separate API users for each integrated system.
- Perform negative testing to validate error handling.


## Concurrency

It is also important to follow these recommendations on concurrency:

- Optimally, **4–8 threads** should run concurrently depending on the complexity of the thread.
- The global system timeout is **400 seconds**, so it is highly recommended that you set your timeout to a greater value.


## Ingestion

- The maximum number of records in an uploaded usage file is **200,000**.